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Nutrient transport and dynamics in the South China Sea: A modeling study
Progress in Oceanography ( IF 4.1 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.pocean.2020.102308 Zhongming Lu , Jianping Gan , Minhan Dai , Xiaozheng Zhao , Chiwing Rex Hui
Progress in Oceanography ( IF 4.1 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.pocean.2020.102308 Zhongming Lu , Jianping Gan , Minhan Dai , Xiaozheng Zhao , Chiwing Rex Hui
Abstract The South China Sea (SCS) is one of the largest marginal seas in the world, yet the processes that drive its nutrient distribution are not well understood. Using the three-dimensional China Sea Multiscale Ocean Modeling System (CMOMS) embedded with a nitrogen-phosphorus-phytoplankton-zooplankton-detritus ecosystem model, we investigated nutrient transport and dynamics in the SCS. The model was well validated with field and remotely sensed observations. We found that the unique layered distribution of nutrients that increases from north to south in the upper layer and increases in the opposite direction in the middle and deep layers. We found that the lateral and vertical fluxes associated with three-dimensional ocean circulation and biogeochemical processes shape the distribution. The lateral fluxes are provided extrinsically by the sandwich-like transport through Luzon Strait (LS) and the exchanges through other straits, and intrinsically by the interior vertical motion due to flow-slope topography interaction. The nutrient deficiency in the upper layer due to dilution by inflow from the Western Pacific Ocean is mainly compensated by the upward nutrient-rich deep water. The nutrient transport is jointly regulated by volume transport and the uneven spatiotemporal distribution of nutrients. We demonstrated that labile organic matter plays an important role in total nutrient budgets. In euphotic layer, biological production is the major sink, but remineralization contributions to PO4 are more important than to NO3 due to the higher recycling rate of PO4. In the shelf water, coastal upwelling serves as major source for both NO3 and PO4, vertical diffusion is another important source of PO4 due to the strong downward increasing gradient.
更新日期：2020-04-01
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